/*
 * @Author: Zhijie Luo
 * @LastEditors: Zhijie Luo
 * @Date: 2021-09-21 21:30:00
 * @LastEditTime: 2021-09-21 22:11:36
 * @Description: 
 */

// 实现类型判断 
//递归实现深拷贝

function deepClone (obj){ // 判断obj 是 null 还是 undefined 

}